A bag contains 17 coins consisting of pennies and dimes. The total value of the coins is $1.25. Which system of equations can be used to
determine the number of pennies, p, and the number of dimes, d, in the
bag?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.